Answer:
Eco-labels
Explanation:
According to my research on non-genetically modified grocery products, I can say that based on the information provided within the question Maria has made use of Eco-labels for her decision. These are labels that are added to products or services proven environmentally preferable overall such as non-genetically modified products like soy milk.
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In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.